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A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs

Title
A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs
Author
권오경
Keywords
On-chip relaxation oscillator; temperature compensation; delay of comparator; bandgap reference; trimming circuit
Issue Date
2016-12
Publisher
IEEK PUBLICATION CENTER
Citation
JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, V. 16, NO 6, Page. 728-735
Abstract
A 70 MHz temperature-compensated on-chip CMOS relaxation oscillator for mobile display driver ICs is proposed to reduce frequency variations. The proposed oscillator compensates for frequency variation with respect to temperature by adjusting the bias currents to control the change in delay of comparators with temperature. A bandgap reference (BGR) is used to stabilize the bias currents with respect to temperature and supply voltages. Additional temperature compensation for the generated frequency is achieved by optimizing the resistance in the BGR after measuring the output frequency. In addition, a trimming circuit is implemented to reduce frequency variation with respect to process. The proposed relaxation oscillator is fabricated using 45 nm CMOS technology and occupies an active area of 0.15 mm(2). The measured frequency variations with respect to temperature and supply voltages are as follows: (i) +/- 0.23% for changes in temperature from -30 to 75 degrees C, (ii) +/- 0.14% for changes in V-DD1 from 2.2 to 2.8 V, and (iii) +/- 1.88% for changes in V-DD2 from 1.05 to 1.15 V.
URI
http://www.dbpia.co.kr/Journal/ArticleDetail/NODE07086522http://repository.hanyang.ac.kr/handle/20.500.11754/102328
ISSN
1598-1657; 2233-4866
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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